Former Pacific Treatment Site Cleanup & Closure

Equipoise achieves no further action finding and closure of the former Pacific Treatment site, a former hazardous waste storage and treatment facility, located at 2190 Main Street, San Diego, California.

In May 1986, an unauthorized release case was opened  when a tar-like product was observed in the excavation during the removal of four underground storage tanks that reportedly stored diesel. Soil sampling conducted after the tank removal showed low concentrations of petroleum hydrocarbons.

Groundwater monitoring was conducted from June 1996 until June 25, 2015.  Free product removal methods previously conducted at the site by prior consultants, which included: purging with a bailer, purging with a vacuum truck, absorbent socks, passive and active skimmers, and dual phase vapor extraction, were ineffective.

In 2014, Equipoise successfully implemented a full-scale bioslurping remediation plan—a method which combines vacuum assisted product removal with soil vapor extraction to simultaneously remove product and remediate soil vapor—using the existing monitoring well network resulting in the closure of the site.  For more information follow the link below.

Equipoise Celebrates 20 Years in Business

equipoise-20Equipoise proudly celebrates 20 years in business dedicated to exceeding our clients’ objectives by providing expert technical professionals and superior service since 1996.

Equipoise Appears Before the San Gabriel Valley Legislative Caucus

On May 20, 2016, more than 80 members of the public, city officials and water agency representatives attended a hearing hosted by the San Gabriel Valley Legislative Caucus to hear first-hand from regulators and responsible parties on the progress of the on-going cleanup of contaminants in the San Gabriel Valley’s groundwater basin.  Appearing before the caucus—among State Senators, Congresswomen, and Assembly members alike—was Equipoise Principal Geologist, Mr. Klaus Rohwer, P.G., to provide expert testimony on the tremendous progress made over the past 23 years, challenges faced and path forward.

Declared a Superfund site by the EPA in 1984, the San Gabriel Basin is the main source of drinking water for 1.4 million people. The presentations focused on three of the six sites or Operable Units (OUs) within the San Gabriel Basin Superfund Site that are currently at important stages of design, construction and ongoing operations: Baldwin Park OU, Puente Valley OU and El Monte OU.

See the full press release for additional details or view PDF version.

Equipoise Achieves a Finding of No Further Requirements for a Property within a Superfund Site

After a decade of assessment and remediation, Equipoise Corporation has achieved the rare feat of receiving a finding of No Further Requirements (NFR) for a property located within a Superfund Site. The 1.6 acre former Charter Communications property, located on the northwest corner of the intersection of Mission Road and Date Avenue in Alhambra, California, is situated within Area 3 Operable Unit of the United States Environmental Protection Agency’s San Gabriel Valley Superfund Site.  On August 8, 2013, the Los Angeles Regional Water Quality Control Board, the public agency with primary responsibility for the property, issued a NFR closure letter stating, soils impacted by tetrachloroethene (PCE) and trichloroethene (TCE) have been cleaned up to standards suitable for commercial and industrial land use and, if permitted by local zoning, residential land use.  For more details follow the link below.